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Finding the Fourth Proportional to 128,588.58, 177,423.54 and 77,609.58

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Solution

The fourth proportional to 128,588.58, 177,423.54 and 77,609.58 is: 107,083.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,588.58 : 177,423.54 = 77,609.58 : x
  2. Step 2: Convert to fraction form
    128,588.58/177,423.54 = 77,609.58/x
  3. Step 3: Cross multiply
    128,588.58x = 177,423.54 × 77,609.58
  4. Step 4: Simplify right side
    128,588.58x = 13,769,766,421.51
  5. Step 5: Solve for x
    x = 13,769,766,421.51/128,588.58
  6. Step 6: Final answer
    x = 107,083.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.